2a+2b = 26
2a-3b = 5
now subtract, and the a goes away, and you can find b.
a+2b=13
2a-3b=5
3 answers
oops
2a+4b=26
2a+4b=26
Eq1: a + 2b = 13.
Eq2: 2a - 3b = 5.
Multiply both sides of Eq1 by -2 and the Eqs:
-2a - 4b = -26.
2a - 3b = 5.
Sum: -7b = -21,
b = 3.
In Eq1, replace b with 3 and solve for a.
Eq2: 2a - 3b = 5.
Multiply both sides of Eq1 by -2 and the Eqs:
-2a - 4b = -26.
2a - 3b = 5.
Sum: -7b = -21,
b = 3.
In Eq1, replace b with 3 and solve for a.